Struct bevy_ecs::query::OptionFetch [−][src]
pub struct OptionFetch<T> { /* fields omitted */ }
Expand description
The Fetch
of Option<T>
.
Trait Implementations
type State = OptionState<T::State>
Returns true if (and only if) every table of every archetype matched by this Fetch contains
all of the matched components. This is used to select a more efficient “table iterator”
for “dense” queries. If this returns true, Fetch::set_table
and Fetch::table_fetch
will be called for iterators. If this returns false, Fetch::set_archetype
and
Fetch::archetype_fetch
will be called for iterators. Read more
Creates a new instance of this fetch. Read more
unsafe fn set_archetype(
&mut self,
state: &Self::State,
archetype: &Archetype,
tables: &Tables
)
unsafe fn set_archetype(
&mut self,
state: &Self::State,
archetype: &Archetype,
tables: &Tables
)
Fetch Self::Item
for the given archetype_index
in the current Archetype
. This must
always be called after Fetch::set_archetype
with an archetype_index
in the range of
the current Archetype
Read more
Fetch Self::Item
for the given table_row
in the current Table
. This must always be
called after Fetch::set_table
with a table_row
in the range of the current Table
Read more
SAFETY: OptionFetch
is read only because T
is read only
Auto Trait Implementations
impl<T> RefUnwindSafe for OptionFetch<T> where
T: RefUnwindSafe,
impl<T> Send for OptionFetch<T> where
T: Send,
impl<T> Sync for OptionFetch<T> where
T: Sync,
impl<T> Unpin for OptionFetch<T> where
T: Unpin,
impl<T> UnwindSafe for OptionFetch<T> where
T: UnwindSafe,
Blanket Implementations
Mutably borrows from an owned value. Read more
Convert Box<dyn Trait>
(where Trait: Downcast
) to Box<dyn Any>
. Box<dyn Any>
can
then be further downcast
into Box<ConcreteType>
where ConcreteType
implements Trait
. Read more
Convert Rc<Trait>
(where Trait: Downcast
) to Rc<Any>
. Rc<Any>
can then be
further downcast
into Rc<ConcreteType>
where ConcreteType
implements Trait
. Read more
Convert &Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &Any
’s vtable from &Trait
’s. Read more
Convert &mut Trait
(where Trait: Downcast
) to &Any
. This is needed since Rust cannot
generate &mut Any
’s vtable from &mut Trait
’s. Read more
Attaches the provided Subscriber
to this type, returning a
WithDispatch
wrapper. Read more
Attaches the current default Subscriber
to this type, returning a
WithDispatch
wrapper. Read more